Groundwater – Flashcards
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aquifer
answer
underground layer of permeable rock from which groundwater can be removed
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impermeable
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not allowing a fluid to pass through
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permeable
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allowing a fluid to pass through
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porosity
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amount of air space between soil or rock particles
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water table
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top of the saturated zone in groundwater
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The water table _____.
rises and falls with precipitation
is the bottom layer of the saturated zone
is a layer of porous rock below an aquifer
always stays in the same place
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The water table can be anywhere from a foot to hundreds of feet below the surface. It is not always in the same place, and it may rise or fall, depending on the amount of precipitation and the amount that people pump out of the ground.
rises and falls with precipitation
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Groundwater _____.
is recharged by precipitation
stays in one place and never moves
is only found in areas with wet climates
exists mostly as underground rivers and lakes
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Groundwater forms when precipitation, rain, snow, sleet, hail, or freezing rain soaks into the ground It settles into three main layers- the saturated zone, the water table, and the unsaturated zone.
is recharged by precipitation
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Which of the following is the most permeable?
shale
clay
gravel
nonporous rock
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Sand and gravel are highly permeable. Clays and soils with mixed particle sizes have low permeability.
gravel
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Which of the following materials is the least porous?
loosely packed gravel
sorted sand and rock
unsorted sand and rock
large pebbles and boulders
answer
large pebbles and boulders
